meson: Correct license to GPL-2.0

Parts of flashrom are 2.0+ but some are not. As Meson's purpose is to
link these together, it should advertise only GPL-2.0 for the whole.

Change-Id: Iab99c74f5f9d54dac56085ecc7475b14be00a310
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/35584
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: David Hendricks <david.hendricks@gmail.com>
diff --git a/meson.build b/meson.build
index 0696ce4..fda1ab8 100644
--- a/meson.build
+++ b/meson.build
@@ -1,6 +1,6 @@
 project('flashromutils', 'c',
   version : '1.0',
-  license : 'GPL-2.0+',
+  license : 'GPL-2.0',
   meson_version : '>=0.47.0',
   default_options : ['warning_level=2', 'c_std=c99'],
 )